Synthesis and Supramolecular Association of Immobilized NCN‐Pincer Platinum(II) Complexes on Hyperbranched Polyglycerol Supports

Pertosylation of hyper- branched polyglycerol (Mn = 2000; Mw/Mn = 1.3) followed by partial dis- placement of the tosyl groups with car- boxylic acid functionalized NCN-pincer platinum(ii) complexes (PtI-2,6- (NMe2CH2)2C6H2-4-COOH), resulted in covalent attachment of the NCN- pincer complexes to the polyglycerol. These functionalized hyperbranched macromolecules have been character- ized by 1 H, 13 C, and 195 Pt NMR, UV- visible, and IR spectroscopy. The pres- ence of Pt and I atoms renders them directly visible by transmission electron microscopy (TEM) without staining procedures, which offers images of as- sociated hyperbranched macromole- cules. TEM micrographs show disk- shaped structures with a small size-dis- tribution (15±20 nm), and characteristic core-shell ring structures. The thickness of the corona observed in TEM could be correlated with the substitution degree with pincer platinum moieties.